I can not provide you with an answer on the specific temperature but will point to some issues to consider as you implement.
Where is the sensor taking the temperature from? This may seem obvious but to be helpful it needs to be after compression. It probably is, but just want to be clear for others who come accross this since some sensors are taking pre-compressed temps.
If you base it on temperatures before the jet - you may not know if you are using too little or too much water for your intent.
For purely an intercooler function rather than utilizing all the benefits of water injection, you don't want to inject too much water because if you are leaving your fuel settings rich so that the engine would run safely even without water injection you would likely lose power with water and rich fuel settings.
I think one application that would be very interesting if your ECU can handle this would be to have the ECU not only control the on/off function of the water injection but also the flow of water. This would require the jet to be before the temperature sensor - the higher the temperature the more water is injected - the lower the temperature the less water is injected. Will your ECU provide a pulse width signal from a map based on intake temperature as the load?
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